Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	1500
2001	2000
2002	5000
2003	47250
2004	94370
2005	160000
2006	280000
2007	563000
2008	854627
2009	1085062
2010	1571308
2011	2020637
2012	2379900
2013	2550775
2014	3225258
2015	3652000
2016	3117002
2017	2660000
2019	1937000
2020	1653000
2021	1653000